Fix type of SnowflakeCursorBase.__iter__

Author: sfc-gh-bchinn

src/snowflake/connector/cursor.py

@@ -1665,7 +1665,7 @@ def reset(self, closing: bool = False) -> None:
         if not self.connection._reuse_results:
             self._result_set = None
 
-    def __iter__(self) -> Iterator[dict] | Iterator[tuple]:
+    def __iter__(self) -> Iterator[FetchRow]:
         """Iteration over the result set."""
         while True:
             _next = self.fetchone()